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1.
Any kind of bad break or bad luck.
"Fuck my shit" his king high straight beat my jack high.
by joseph greiman March 03, 2007
 
2.
When you take a cool shaped shit, then freeze it and later, with a condom on it use it as a dildo or other sexually stimulating device.
"Aww kids! Look at this shit! It looks like a dick! Lets fuck my shit"

"OK Ma, I'll get the camera"
by fuck my shit May 06, 2008